Browsing NTNU Open by Author "McEnroe, Suzanne"
Now showing items 21-37 of 37
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Magnetic properties of anorthosites: A forgotten source for planetary magnetic anomalies?
Brown, Laurie L.; McEnroe, Suzanne (Journal article; Peer reviewed, 2008)[1] Anorthosites, igneous rocks very rich in plagioclase, rarely considered to be strongly magnetic, are common on Earth, and the Moon, and inferred to be on other planets. Magnetic properties of anorthosites could be ... -
Magnetism at Depth: A View from an Ancient Continental Subduction and Collision Zone
McEnroe, Suzanne; Robinson, Peter; Church, Nathan Stewart; Purucker, Micheal (Journal article; Peer reviewed, 2018)Recent sophisticated global data compilations and magnetic surveys have been used to investigate the nature of magnetization in the lower crust and upper mantle. Two approaches to constraining magnetizations are developed, ... -
Magnetization of exsolution intergrowths of hematite and ilmenite: Mineral chemistry, phase relations, and magnetic properties of hemo-ilmenite ores with micron- to nanometer-scale lamellae from Allard Lake, Quebec
McEnroe, Suzanne; Robinson, Peter; Langenhorst, F.; Frandsen, Catherine; Terry, Michael P.; Ballaran, Tiziana (Journal article; Peer reviewed, 2007)[1] Hemo‐ilmenite ores from Allard Lake, Quebec, were first studied over 50 years ago. Interest was renewed in these coarsely exsolved oxides, based on the theory of lamellar magnetism as an explanation for the high and ... -
Mapping and modelling mineral sources of natural remanent magnetization from the Russell Belt microcline-sillimanite gneiss, Northwest Adirondack Mountains, USA
Pastore, Zeudia; McEnroe, Suzanne; Church, Nathan Stewart; Oda, Hirokuni (Peer reviewed; Journal article, 2021)Distinct crustal remanent magnetic anomalies are a strong indicator of rocks with stable natural remanent magnetization (NRM) carriers. The latter are able to store information on the history of a rock over long geological ... -
Mapping magnetic sources at the millimeter to micrometer scale in dunite and serpentinite by high-resolution magnetic microscopy
Pastore, Zeudia; McEnroe, Suzanne; ter Maat, Geertje; Oda, Hirokuni; Church, Nathan Stewart; Fumagalli, Patrizia (Journal article; Peer reviewed, 2018)Rock samples can have wide range of magnetic properties depending on composition, amount of ferromagnetic minerals, grain sizes and microstructures. Here, we used scanning magnetic microscopy, a highly sensitive and ... -
Measuring the Curie temperature
Fabian, Karl; Shcherbakov, V. P; McEnroe, Suzanne (Journal article; Peer reviewed, 2013)[1] Curie point temperatures (TC) of natural and synthetic magnetic materials are commonly determined in rock magnetism by several measurement methods that can be mutually incompatible and may lead to inconsistent results. ... -
Micromagnetic Modes of Anisotropy of Magnetic Susceptibility in Natural Magnetite Particles
Nikolaisen, Even Sunnanå; Fabian, Karl; Harrison, J. Richard; McEnroe, Suzanne (Peer reviewed; Journal article, 2022)Anisotropy of magnetic susceptibility (AMS) is commonly used to assess sedimentation, deformation, tectonics, rock fabric, and texture. Using focused-ion beam nanotomography, we develop a micromagnetic method to investigate ... -
Mixing of heterogeneous, high-MgO, plume-derived magmas at the base of the crust in the Central Iapetus Magmatic Province (Ma 610-550): Origin of parental magmas to a global LIP event.
Grant, T.B.; Larsen, Rune Berg; Müller, Axel; McEnroe, Suzanne (Peer reviewed; Journal article, 2020)High-MgO (>12 wt%) magmas represent some of the most primary and high temperature melts from mantle plumes. The compositional diversity of high-MgO magmas gained by fractional melting within inhomogeneous mantle sources, ... -
Multistep Parametric Inversion of Scanning Magnetic Microscopy Data for Modeling Magnetization of Multidomain Magnetite
Pastore, Zeudia; Church, Nathan Stewart; McEnroe, Suzanne (Peer reviewed; Journal article, 2019)Development in instrumentation and technology now allows for mapping of magnetic anomalies, caused by spatial variations in magnetization in the source material, from the mineral to the crustal anomalies scale. High-resolution ... -
Nonlinear Preisach maps: Detecting and characterizing separate remanent magnetic fractions in complex natural samples
Church, Nathan Stewart; Fabian, Karl; McEnroe, Suzanne (Peer reviewed; Journal article, 2016)Natural remanent magnetization carriers in rocks can contain mixtures of magnetic minerals that interact in complex ways and are challenging to characterize by current measurement techniques. Here a nonlinear mapping scheme ... -
Petrogenesis of Fe-Ti-P rich rock in the Siljan-Hvarnes Intrusion, S.E. Norway
Andersen, Tord Engelhardt (Master thesis, 2021)Siljan -Hvarnes-intrusjonen ligger i Vestfold Graben, i S.E. Norge. Intrusjonen ble formet for 277 M. år siden under den mest aktive vulkanske perioden i dannelsen av Oslo Graben. Intrusjonen består av flere sammenflettede ... -
Portrait of a giant deep-seated magmatic conduit system: The Seiland Igneous Province
B. Larsen, Rune; Grant, Thomas; Sørensen, Bjørn Eske; Tegner, Christian; McEnroe, Suzanne; Pastore, Zeudia; Fichler, Christine; Nikolaisen, Even; Grannes, Kim Rune Bragstad; Church, Nathan Stewart; ter Maat, Geertje; Michels, Alexander (Journal article; Peer reviewed, 2018)The Seiland Igneous Province (SIP), Northern Norway, contains > 5000 km2 of mafic and ultramafic intrusions with minor alkaline, carbonatite and felsic rocks that were intruded into the lower continental crust at a depth ... -
Separating geometry- from stress-induced remanent magnetization in magnetite with ilmenite lamellae from the Stardalur basalts, Iceland
ter Maat, Geertruida Wilhelmina; Fabian, Karl; Church, Nathan Stewart; McEnroe, Suzanne (Peer reviewed; Journal article, 2020)Realistic geometries of magnetite grains from the Stardalur volcano, Iceland, were obtained by Focused Ion Beam Scanning Electron Microscopy nanotomography. These magnetite grains are subdivided by oxidation‐exsolution ... -
Size and shape dependence of the magnetic ordering temperature in nanoscale magnetic particles
Shcherbakov, V. P; Fabian, Karl; Sycheva, N. K.; McEnroe, Suzanne (Journal article; Peer reviewed, 2012)Natural rocks and synthetic analogues can contain extremely small scaled magnetic minerals varying in shape from approximately equidimensional nanoparticles to lower dimensionally shaped lamellae resembling thin films or ... -
Spin orientation in solid solution hematite-ilmenite
Brok, Erik; Frandsen, Cathrine; Lefmann, Kim; McEnroe, Suzanne; Robinson, Peter; Burton, Benjamin P; Hansen, Thomas C; Harrison, Richard (Journal article; Peer reviewed, 2017)The spin orientation in synthetic hematite-ilmenite samples and in a sample of natural hematite was studied from room temperature to above the antiferromagnetic-paramagnetic phase transition (the Néel temperature; TN ≈ ... -
The contribution of maficultramafic mineral sources to magnetic anomalies
ter Maat, Geertruida Wilhelmina (Doctoral theses at NTNU;2019:210, Doctoral thesis, 2019)The interpretation of magnetic anomalies at all scales relies on the understanding of the petrophysical and rock magnetic properties. The stability of magnetic minerals in the crust depends on the composition and ... -
The structural and metamorphic evolution of the Averøya eclogite, WGR Norway
Auglænd, Silje (Master thesis, 2017)En lagdelt eklogitt kropp på Averøya ligger rundt 35 kilometer nordøst fra en mikrodiamant lokalitet på Svartberget, som markerer den østlige enden av Nordøyane Ultra Høyt-Trykk (UHT) domene på vestkysten av Norge. Denne ...